Aerostar 19 7/8 x 21 1/2 x 1 MERV 11 Air Filter， 19 7/8" x 21 1/2" x 1"， Made in the USA， Pleated (Pack of 6)</br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/51juPano7-L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51CAzhWKACL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51byFLocRML.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41JVpGlBNcL.jpg' noproxy></br>